Dynamo-electric machine.



C. A. PARSONS 61A. H. LAW.

DYNAMO ELECTRIC MACHINE.

APPLICATION FILED JULY 29. m2.

Patented Sept 5, 1916.

b U i JD 01 C, 1 D17 11/ 3 Q C d 1 0 1D 6 0 ,1 d 1 A A w w dr x a.

UNITED STATES PATENT OFFICE.

CHARLES ALGERNON PARSONS AND ALEXANDER HENRY LAW, OF NEWCASTLE-UPON- TYNE, ENGLAND; SAID LAW ASSIGNOR 'IO SAID PARSONS.

DYNAMO-ELECTRIC MACHINE.

Application filed July 29, 1912.

To all whom it may concern:

Be it known that we, CHARLES ALoEnNoN PARSONS and ALEXANDER HENRY Law, subjects of the King of Great Britain and Ireland, both residing at Heaton \Vorks, Newcastle-upon-Tyne, in the county of Northumberland, England, have invented certain new and useful Improvements in and Relating to Dynamo-Electric Machines, of which the following is a specification.

This invention relates to dynamo electric machines and particularly to a method by which the armature or like conductors are secured in slots against the action of mechanical or electrical forces.

According to one method which has already been proposed, each conductor is formed so that when placed within the slot a hollow is formed within and extending throughout the length of the conductor. There is then inserted within the hollow conductor a suitable core, which, in some cases, consists of two tapered pieces which are inserted from opposite ends of the hollow conductor and which when subjected to end pressure act as wedges to push the conductor outward against the walls of the slot, whereby the conductor is held in position. On account, however, of the great friction produced between the core and the conductor, difficulty is experienced in driving the wedges up tightly without displacing the conductor or its surrounding insulation.

The object of the present invention is to overcome the above diiiiculty.

The invention consists in a method of securing armature or like conductors in which a core inserted within such conductor is per manently expanded laterally throughout its length by compression in a longitudinal direction.

The invention also consists in a method of securing armature or like conductors in which a core is inserted in short lengths within the conductor, each such length after insertion being permanently expanded laterally whereby the desired securing effect is obtained.

The invention further consists in the method of securing the electrical conductors in dynamo electric machines as hereinafter described.

Referring now to the accompanying drawings: Figure 1 is a cross section of a partially embedded conductor secured in a slot Specification of Letters Patent.

Patented Sept. 5, 1916.

Serial No. 712,106.

by the method according to the present invention. Figs. 2, 3 and 4 are similar views, but illustrate the invention as applied to conductors which are entirely embedded, while Figs. 5, 6 and 7 are sectional views llustrating the application of the present invention to the case in which several conductors are placed within the same slot. Fig. 8 is a longitudinal section of Fig. 2, showing the core in several parts, and an example of a hammering tool.

In carrying the invention into effect as applied to the partially embedded conductor shown in Fig. 1, the conductor is preferably made in two parts, a and b, which when surrounded by the usual insulating material, 0, are inserted in the slot formed for example in an armature partly shown at (Z. For the purpose of the present invention, the cross section of the slot is so chosen with respect to that of the entire conductor that when the conductor is in position in the slot, it substantially fills the latter, but at the same time leaves a hollow space which extends within the conductor from end to end thereof. When in position the conductor is thus substantially tubular, since the portions of the conductor parts, a and Z), contact at the place where they emerge through the restricted part of the slot, and is moreover open at both ends. A core 0, of any suitable material which will permanently assume an increased cross sectional area when subjected to longitudinal compression, is then inserted within the hollow conductor. Usually such a core is formed of several short lengths of aluminium, lead or copper, and the first length is inserted within the conductor in a position about midway along the length of the latter. A suitable tool 15 then inserted from one end of the hollow conductor and acts as an abutment against which the short length of core can be hammered by a suitable tool inserted from the other end of the hollow conductor. The result of such hammering is similar to that produced by calking, the length of core being permanently expanded laterally and throughout its length whereb the surrounding conductor is forced ra ially outward against the walls of the slot, and is thus held securely in position. Another short length of core is then inserted and hammered up against the first length, this process being repeated until the hollow conductor is filled with the core preferably extending throughout its length. Such a calliing process can obviously be effected by means of suitable hammering tools such as a? (see Fig. 8) inserted from both ends of the hollow conductor and alternately or simultaneously hammering both ends of the core length.

This invention it will be seen is applicable to conductors which are totally embedded in slots which may be closed as shown in Fig. 2, or open as shown in Fi 3, in both of which arrangements the various parts are lettered similarly to those in Fig. 1. Further, the conductors instead of being divided into two parts as shown in Fig. 1, may be formed in one part, in which case a tubular formation is preferable, the tube being split as desired. On the other hand each conductor is some times formed in more than two parts, anexample of such an arrangement being shown in Fig. 4 in which the totally embedded conductor is made in four parts, a, Z), 7 and g. When such a conductor is in position in the slot, it is surrounded as before by insulation 0 and is securely locked in position by means of a core, a, which is given a permanent lateral expansion throughout its entire length in the manner already described.

Figs. 5, 6 and 7 show an arrangement in which more than one conductor is placed within a slot. In the first of these arrangements each conductor is shown by way of example as being made of three parts a, b and f, which surround the expanded core, 6, and are contained within the insulation, 0, while the entire conductors are separated from one another by insulation it. When more than one conductor is placed in the same slot, it is obviously not essential that each one be provided with an expanded core. For instance as shown in Fig. 6, two only of the six conductors are provided with an expanded core while the remaining conductors, 70, Z, m and a are solid, all the conductors being separated from one another by a suitable insulation h, and secured in position by the insertion of the expanded cores 0. In such an arrangement the conductors having an expanded core may be divided into any number of parts arranged in any suitable manner. Further if desired the conductors which have no expanded core may be divided in such a manner that they themselves are also caused to expand laterally in consequence of each part thereof being provided with inclined contacting faces, an example of such an arrangement being shown in Fig. 7, in which the conductors having no expanded core are divided into three parts, g), g and 7*. It will be seen that in such an arrangement when the core 6 is expanded laterally, the part 1' of the ordinary conductor becomes wedged in between the other two parts, 79 and 9, thereby causing the latter to be forced outward against the surrounding insulation and walls of the slot. It will further be seen that if desired the expanded core which is inserted in the conductor may itself also act as an electrical conductor, it being only necessary for the purpose of the present invention that such a core be made of a material which will permanently assume an increased cross sectional area when subjected to compression in a longitudinal direction. It will further be seen that many modifications may be made in the manner of carrying the invention into efiect without in any way departing from the spirit of the same.

We claim 1. The combination in a slot of a dynamo electric machine of a plurality of conducting parallel members positioned within said slot and laminated material disposed between said members and within said slot, the planes of lamination of said material being substantially at right angles to the axis of the slot.

2. The combination in a slot of a dynamo electric machine of a hollow conductor and a core molecularly discontinuous in the direction of the length of said slot.

3. The combination in a slot of a dynamo electric machine of a hollow conductor and a core extending throughout such length of said hollow conductor as lies within said slot, said core being molecularly discontinuous in the direction of its length and formed of several short lengths of metal.

4:. The combination within a slot of a dynamo electric machine of a group of conducting parallel members positioned within said slot and laminae of metal positioned within said slot and interposed between the members of said group, the planes of lamination of the interposed metal being substantially at right angles to the axis of the slot, said laminae being in a state of compression.

5. The combination in the slot of a dynamo electric machine of a group of conductors, some of said conductors being cut longitudinally into several parts wedging surfaces on some of said parts, and a permanently compressed core molecularly discontinuous in the direction of its length acting to force the conductor parts apart.

6. A method of securing in an armature or like slot a conductor which consists in forming the conductor of several parallel parts, next associating the parts to provide therebetween a passage way which is substantially confined in all directions at right angles to the longitudinal axis of the conductor parts, and then spreading the conductor parts by a plurality of discontinuous solid expanded members.

7. A method of securing armature or like hollow conductors of dynamo electric machines, which consists in inserting a molecularly discontinuous core piece-meal within such conductor, and then individually permanently expanding each piece laterally throughout its length to secure said conductor.

8. A method of securing armature or like hollow conductors of dynamo electric inachines, which consists in forming the conductors of several parallel parts, assembling the parts to form a hollow, inserting into the hollow a core in short len ths, inserting each length in turn in the hol ow conductor, and expanding permanently each piece laterally after each insertion.

In testimony whereof, we afiix our signatures in presence of two witnesses.

CHARLES ALGERNON PARSONS. ALEXANDER HENRY LAW. WVitnesses:

FREDERICH GORDON HAY DEDFORD.

ALBERT W. GAOR.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C." 

